Gael bumpff



UNITED STATES PATENT OFFICE.

CARL RUMPFF, OF APRATH, NEAR ELBERFELD, PRUSSIA, GERMANY.

MANUFACTURE OF COLORING-MATTER FROM NAPHTHYLAMINE.

SPECIFICATION forming part of Letters Patent No. 260,242, dated June 2'7, 1882,

Application filed April 21, 1882. (Specimens-l ing a New Brown Dye-Stuff, of which the following is a specification.

This invention relates to a brown dye-stuffor coloring-matter which is produced by the action of diazoazobenzolsulfonate of soda upon naphthylamine in acid solution.

In carrying out my invention I take, fifty pounds of amidoazobenzolsulfonate of soda dissolved in five hundred pounds of water cooled down to 3 centigrade. To this solution I add slowly seventy-five pounds of'muriatic acid, and thereafter eleven pounds sodium nitrite dissolved in forty pounds of water. After several hours rest the liquid is poured into a solution containing twenty-five pounds of naphthylamine, fifty pounds of m'uriatic acid, and

color is fast against soap and light.

What I claim as new, and desire to secure by Letters Patent, is-

The new brown dye-stuff or coloring-matter which is produced by the action of diazoazobenzolsulfonate of soda upon naphthylamine in an acid solution.

CARL RUMPFF.

Witnesses:

I. FERD. KEDENBURG, A. SoHnnLE. 

